Adjustable photovoltaic support purline connecting device

The utility model relates to the field of photovoltaic supports, in particular to an adjustable photovoltaic support purline connecting device which comprises a photovoltaic panel, a purline, a purline connecting device and a supporting device. The purline connecting device comprises a first fixing sleeve, a connecting block, a sliding block and a second fixing sleeve, the first fixing sleeve is arranged at one end of the purline, and a limiting disc used for installing the connecting block is arranged at the top end of the first fixing sleeve; the connecting block is hemispherical, the bottom end of the connecting block is rotationally arranged in the sliding groove, and the hemispherical surface of the connecting block is provided with the sliding groove which is in a cross shape in an overhead view; the sliding block is slidably arranged in the sliding groove, and a horizontal connecting rod is arranged at the top end of the sliding block. The second fixing sleeve is arranged at the other end of the purlin